element = StorageAccess.createElement(this._parentElement, fullPath, this._document);

            this._byName[fullPath] = element;

          }

          for (var p in updateProperties) if (updateProperties.hasOwnProperty(p)) {

            var v = updateProperties[p];

            var attrName = 'tp-' + encodeForAttributeName(p);

            if (v === null)

              element.removeAttribute(attrName);

            else

              element.setAttribute(attrName, v);

          }

        }

      }

​

      this._parentElement.setAttribute('data-teapo-file-count', <any>this._parentElement.children.length);

      this._parentElement.setAttribute('data-edited-utc', <any>timestamp);

​

      callback(null);

    }

​

    read(

      fullPaths: string[],

      callback: (error: Error, byFullPath: PropertiesByFullPath) => void): void {

      var byFullPath: PropertiesByFullPath = {};

      if (fullPaths === null || typeof fullPaths === 'undefined') {

        for (var fullPath in this._byName) if (this._byName.hasOwnProperty(fullPath)) {

          var element = this._getExistingElement(fullPaths[i]);

          var propBag = this._readFileProperties(element);

          byFullPath[fullPaths[i]] = propBag;

        }

      }

      else {

        for (var i = 0; i < fullPaths.length; i++) {

          var propBag = element ? this._readFileProperties(element) : null;

          byFullPath[fullPaths[i]] = propBag;

        }

      }

      callback(null, byFullPath);

    }

​

    private _readFileProperties(element: HTMLElement) {      

      var properties: { [property: string]: string; } = {};

      for (var i = 0; i < element.attributes.length; i++) {

        var attr = element.attributes.item(i);

        if (!startsWith(attr.name.toLowerCase(), 'tp-')) continue;

        var propertyName = decodeFromAttributeName(attr.name.slice(3 /* 'tp-'.length */));

        properties[propertyName] = attr.value;

      }

      return properties;

    }

​